{"id":9179,"date":"2024-08-21T21:31:19","date_gmt":"2024-08-21T13:31:19","guid":{"rendered":"https:\/\/tommykwan.com\/blog\/?p=9179"},"modified":"2024-08-21T22:49:41","modified_gmt":"2024-08-21T14:49:41","slug":"ils-instrument-landing-system","status":"publish","type":"post","link":"https:\/\/tommykwan.com\/blog\/aviation\/ils-instrument-landing-system\/","title":{"rendered":"ILS – Instrument Landing System"},"content":{"rendered":"

ILS (Instrument Landing System) is used for precision approach<\/strong>, particular useful for low visibility condition<\/strong> and\/or bad weather.<\/p>\n

 <\/p>\n

Component of ILS<\/span><\/p>\n

    \n
  1. Localizer<\/li>\n
  2. Glide slope<\/li>\n
  3. Distance Measuring Equipment (DME) or Marker Beacons<\/li>\n
  4. Runway lights<\/li>\n<\/ol>\n

    \u7559\u610f\u98db\u6a5f\u65b9\u5411!!!<\/strong><\/p>\n

    \"GBN_system_graphic\"<\/p>\n

    Function of each components:<\/p>\n

      \n
    1. Localizer
      \nGuide the aircraft to the centerline of the runway (lateral guidance)<\/li>\n
    2. Glide slope
      \nGuide the aircraft to use the designated descend profile (vertical guidance)<\/li>\n
    3. Distance Measuring Equipment (DME) or Marker Beacons
      \nProvide distance information<\/li>\n
    4. Runway lights
      \nImportant visual reference for the pilots to make the final decision (continue or go around)<\/li>\n<\/ol>\n

      \u7559\u610f\u98db\u6a5f\u65b9\u5411!!!<\/strong><\/p>\n

       <\/p>\n

      More advance about the ILS:<\/p>\n

        \n
      • ILS uses two directional<\/strong> radio signals<\/strong> – localizer and glideslope ;\n
          \n
        • Localizer (108 to 112 MHz frequency) – VHF;<\/li>\n
        • Glideslope (329.15 to 335 MHz frequency) – UHF;<\/li>\n<\/ul>\n<\/li>\n
        • However, both localizer and glideslope are “modify” to become 90Hz and 150Hz<\/li>\n<\/ul>\n

          \"Localizer \"Glideslope\"<\/p>\n

           <\/p>\n

          LOC and GS antenna on an airliner<\/span><\/p>\n

          \"May<\/p>\n

          THX : Aviation Fantasy<\/span><\/a><\/span><\/strong>\u00a0is at\u00a0United States of America (USA)<\/span><\/a><\/span><\/strong>.<\/span><\/p>\n

           <\/p>\n

          More reference:<\/p>\n

          https:\/\/www.faa.gov\/about\/office_org\/headquarters_offices\/ato\/service_units\/techops\/navservices\/gbng\/ils<\/a><\/p>\n

          https:\/\/www.science.gov.hk\/paper\/HKIA_20211030.pdf<\/a><\/p>\n

           <\/p>\n

          Youtube video:<\/p>\n